import { 
  Controller, 
  Get, 
  Post, 
  Put, 
  Delete, 
  Body, 
  Param, 
  Query,
  HttpCode,
  HttpStatus
} from '@nestjs/common';
import { ApiTags, ApiOperation, ApiResponse, ApiBearerAuth } from '@nestjs/swagger';
import { Roles, CurrentUser } from '@app/auth';

// DTOs for system management
class SystemConfigDto {
  siteName?: string;
  siteDescription?: string;
  siteKeywords?: string;
  siteUrl?: string;
  siteLogo?: string;
  siteFavicon?: string;
  siteFooter?: string;
  allowRegistration?: boolean;
  requireEmailVerification?: boolean;
  enableComments?: boolean;
  enableCache?: boolean;
  cacheTimeout?: number;
  maxUploadSize?: number;
  allowedFileTypes?: string[];
}

class CacheConfigDto {
  enableRedis?: boolean;
  redisHost?: string;
  redisPort?: number;
  redisPassword?: string;
  defaultTtl?: number;
}

class EmailConfigDto {
  emailHost?: string;
  emailPort?: number;
  emailUser?: string;
  emailPassword?: string;
  emailFrom?: string;
  enableTls?: boolean;
}

class BackupConfigDto {
  enableAutoBackup?: boolean;
  backupInterval?: number;
  maxBackupFiles?: number;
  backupPath?: string;
}

@ApiTags('系统管理')
@ApiBearerAuth()
@Controller('admin/system')
export class SystemController {
  constructor() {}

  @Get('info')
  @ApiOperation({ summary: '获取系统信息' })
  @ApiResponse({ status: 200, description: '返回系统信息' })
  @Roles('admin')
  async getSystemInfo() {
    // TODO: 获取系统详细信息
    return {
      code: 200,
      data: {
        server: {
          nodeVersion: process.version,
          platform: process.platform,
          arch: process.arch,
          uptime: process.uptime(),
          cpuUsage: process.cpuUsage(),
          memoryUsage: process.memoryUsage()
        },
        application: {
          name: 'KV Admin',
          version: '1.0.0',
          environment: process.env.NODE_ENV,
          startTime: new Date().toISOString()
        },
        database: {
          type: 'MySQL',
          version: '8.0',
          status: 'connected'
        },
        cache: {
          type: 'Redis',
          status: 'connected',
          keyCount: 0
        }
      },
      message: '获取成功'
    };
  }

  @Get('config')
  @ApiOperation({ summary: '获取系统配置' })
  @ApiResponse({ status: 200, description: '返回系统配置' })
  @Roles('admin')
  async getConfig() {
    // TODO: 从数据库或配置文件获取系统配置
    return {
      code: 200,
      data: {
        site: {},
        cache: {},
        email: {},
        backup: {}
      },
      message: '获取成功'
    };
  }

  @Put('config/site')
  @ApiOperation({ summary: '更新站点配置' })
  @ApiResponse({ status: 200, description: '配置更新成功' })
  @Roles('admin')
  async updateSiteConfig(@Body() configDto: SystemConfigDto) {
    // TODO: 更新站点配置
    return {
      code: 200,
      data: null,
      message: '配置更新成功'
    };
  }

  @Put('config/cache')
  @ApiOperation({ summary: '更新缓存配置' })
  @ApiResponse({ status: 200, description: '缓存配置更新成功' })
  @Roles('admin')
  async updateCacheConfig(@Body() configDto: CacheConfigDto) {
    // TODO: 更新缓存配置
    return {
      code: 200,
      data: null,
      message: '缓存配置更新成功'
    };
  }

  @Put('config/email')
  @ApiOperation({ summary: '更新邮件配置' })
  @ApiResponse({ status: 200, description: '邮件配置更新成功' })
  @Roles('admin')
  async updateEmailConfig(@Body() configDto: EmailConfigDto) {
    // TODO: 更新邮件配置
    return {
      code: 200,
      data: null,
      message: '邮件配置更新成功'
    };
  }

  @Put('config/backup')
  @ApiOperation({ summary: '更新备份配置' })
  @ApiResponse({ status: 200, description: '备份配置更新成功' })
  @Roles('admin')
  async updateBackupConfig(@Body() configDto: BackupConfigDto) {
    // TODO: 更新备份配置
    return {
      code: 200,
      data: null,
      message: '备份配置更新成功'
    };
  }

  @Post('cache/clear')
  @ApiOperation({ summary: '清除缓存' })
  @ApiResponse({ status: 200, description: '缓存清除成功' })
  @HttpCode(HttpStatus.OK)
  @Roles('admin')
  async clearCache(@Body() body: { keys?: string[] }) {
    // TODO: 清除指定缓存或全部缓存
    return {
      code: 200,
      data: {
        clearedKeys: body.keys?.length || 0,
        action: body.keys ? 'partial' : 'all'
      },
      message: '缓存清除成功'
    };
  }

  @Get('cache/stats')
  @ApiOperation({ summary: '获取缓存统计' })
  @ApiResponse({ status: 200, description: '返回缓存统计信息' })
  @Roles('admin')
  async getCacheStats() {
    // TODO: 获取缓存统计信息
    return {
      code: 200,
      data: {
        totalKeys: 0,
        usedMemory: '0MB',
        hitRate: '0%',
        missRate: '0%',
        totalConnections: 0,
        uptime: 0
      },
      message: '获取成功'
    };
  }

  @Get('logs')
  @ApiOperation({ summary: '获取系统日志' })
  @ApiResponse({ status: 200, description: '返回系统日志' })
  @Roles('admin')
  async getLogs(@Query() query: {
    level?: string;
    startDate?: string;
    endDate?: string;
    page?: number;
    limit?: number;
  }) {
    // TODO: 获取系统日志
    return {
      code: 200,
      data: {
        logs: [],
        pagination: {
          page: query.page || 1,
          limit: query.limit || 50,
          total: 0,
          totalPages: 0
        }
      },
      message: '获取成功'
    };
  }

  @Post('backup/create')
  @ApiOperation({ summary: '创建系统备份' })
  @ApiResponse({ status: 200, description: '备份创建成功' })
  @HttpCode(HttpStatus.OK)
  @Roles('admin')
  async createBackup(@Body() body: { type: 'database' | 'files' | 'full'; description?: string }) {
    // TODO: 创建系统备份
    return {
      code: 200,
      data: {
        backupId: 'backup_' + Date.now(),
        type: body.type,
        size: '0MB',
        createdAt: new Date().toISOString()
      },
      message: '备份创建成功'
    };
  }

  @Get('backup/list')
  @ApiOperation({ summary: '获取备份列表' })
  @ApiResponse({ status: 200, description: '返回备份列表' })
  @Roles('admin')
  async getBackupList() {
    // TODO: 获取备份列表
    return {
      code: 200,
      data: {
        backups: []
      },
      message: '获取成功'
    };
  }

  @Post('backup/:id/restore')
  @ApiOperation({ summary: '恢复备份' })
  @ApiResponse({ status: 200, description: '备份恢复成功' })
  @HttpCode(HttpStatus.OK)
  @Roles('admin')
  async restoreBackup(@Param('id') backupId: string) {
    // TODO: 恢复指定备份
    return {
      code: 200,
      data: {
        backupId,
        restoredAt: new Date().toISOString()
      },
      message: '备份恢复成功'
    };
  }

  @Delete('backup/:id')
  @ApiOperation({ summary: '删除备份' })
  @ApiResponse({ status: 200, description: '备份删除成功' })
  @Roles('admin')
  async deleteBackup(@Param('id') backupId: string) {
    // TODO: 删除指定备份
    return {
      code: 200,
      data: null,
      message: '备份删除成功'
    };
  }

  @Post('test/email')
  @ApiOperation({ summary: '测试邮件配置' })
  @ApiResponse({ status: 200, description: '邮件发送测试完成' })
  @HttpCode(HttpStatus.OK)
  @Roles('admin')
  async testEmail(@Body() body: { to: string; subject?: string; content?: string }) {
    // TODO: 测试邮件发送
    return {
      code: 200,
      data: {
        sent: true,
        to: body.to,
        sentAt: new Date().toISOString()
      },
      message: '测试邮件发送成功'
    };
  }

  @Post('maintenance/enable')
  @ApiOperation({ summary: '启用维护模式' })
  @ApiResponse({ status: 200, description: '维护模式已启用' })
  @HttpCode(HttpStatus.OK)
  @Roles('admin')
  async enableMaintenance(@Body() body: { message?: string; estimatedEnd?: string }) {
    // TODO: 启用维护模式
    return {
      code: 200,
      data: {
        enabled: true,
        message: body.message || '系统正在维护中',
        estimatedEnd: body.estimatedEnd
      },
      message: '维护模式已启用'
    };
  }

  @Post('maintenance/disable')
  @ApiOperation({ summary: '禁用维护模式' })
  @ApiResponse({ status: 200, description: '维护模式已禁用' })
  @HttpCode(HttpStatus.OK)
  @Roles('admin')
  async disableMaintenance() {
    // TODO: 禁用维护模式
    return {
      code: 200,
      data: {
        enabled: false
      },
      message: '维护模式已禁用'
    };
  }
}
